Obama plans to urge the leaders to step carefully in exit negotiations

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Military personnel poses in front of a NATO unmanned drone outside PGE National Stadium, the venue of the NATO Summit, prior to the official opening of the NATO summit in Warsaw, Poland, Friday, July 8, 2016.

The NATO military alliance doesn't only need to reinforce its own armed forces, it also must also come to the aid of partner nations in the Middle East and North Africa that are threatened by extremist violence, NATO's chief said Friday.

"For our nations to be safe, it's not enough to keep our defenses strong, we must help to make our partners stronger," NATO Secretary-General Jens Stoltenberg said, speaking before the opening of a key summit meeting of alliance heads of state and government.

"Training local forces is often our best weapon against violent extremism," Stoltenberg told a forum of defense and security experts. Among the items on the NATO summit's ambitious agenda is increased assistance for Iraq's military, extension of the West's financial commitment to the Afghan military and police, and aid for Tunisia.

Later, arriving at the Warsaw sports stadium where NATO leaders will hold two days of meetings, Stoltenberg predicted "a landmark summit." Leaders will get NATO more involved in the campaign against Islamic State by authorizing use of AWACS surveillance aircraft to assist the U.S.-led coalition fighting the group, he said.

"The decisions we're going to take together will once again confirm that Europe and North America stand together, act together to support all allies against any threats," Stoltenberg said.

In Warsaw, U.S. President Barack Obama and leaders from NATO's 27 other allies will also order deployment of multinational units on the alliance's eastern frontiers — a move Germany's defense minister said is proper to counter what she called a "completely unpredictable and aggressive Russia."